Mapping the Spatial Distribution of H_2 in Nearby Galaxies with the Spitzer Infrared Spectrograph

Details Mapping the Spatial Distribution of H_2 in Nearby Galaxies with the Spitzer Infrared Spectrograph Mapping the Spatial Distribution of H_2 in Nearby Galaxies with the Spitzer Infrared Spectrograph

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009eimw.confe..19b&link_type=abstract

"The Evolving ISM in the Milky Way and Nearby Galaxies, The Fourth Spitzer Science Center Conference, Proceedings of the confere

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Galaxies: Ism, Infrared: Galaxies, H_2

Scientific paper

In order to understand the connection between the warm (T = 100 -- 1000 K) molecular gas traced by the pure rotational mid-infrared H_2 lines and the cold (T < 100 K) molecular gas traced by CO (J=1--0), we have undertaken a program to map the spatial distribution of pure rotational H_2 line emission in nearby galaxies with the Spitzer Space Telescope Infrared Spectrograph (IRS). Using our own Spitzer IRS spectral mapping mode observations of M51 and archival Spitzer IRS spectral mapping observations acquired as part of the Spitzer Infrared Nearby Galaxies Survey (SINGS) and other observing programs, we have mapped the spatial distribution of warm molecular gas traced by the H_2 S(0) -- H_2 S(3) pure rotational lines in nearby galaxies. Here, we present maps of the H_2 S(0) -- H_2 S(3) line emission for M51, NGC 628, NGC 3351, and NGC 3521 and compare the H_2 emission distributions to the cold molecular gas distributions traced by CO emission observed as part of the Berkeley-Illinois-Maryland Association Survey of Nearby Galaxies (BIMA SONG). We show that the H_2 emission distributions are generally spatially coincident with the CO emission; although, some offsets between the H_2 and CO are noted.

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